Improvement in hot-air furnaces



L. B. TUPPER.

Hot Air Furnace,

N0. 122,684. P.atenteud.lan`. 9,1872..

NITE@ TTES LORENZO R. TUPPER, OE NEW YORK, N. Y.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 122,6S4,dated January 9, 1872.

To all whom it may concern:

Be it known that I, LORENZO B. TUPPER, of the city and State of New York, have invented an Improvement in Hot-Air Furnaces; and the following is `declared to be a correct description ofthe same. Y

In hot-air furnaces difficulty has arisen i Obtaining the necessary extent of heating-surface to thoroughly warm the air without injuring the quality thereof by excessive heat; and in the heating of the different portions of buildings from the same furnace it is found that somel rooms will be too hot and others not sufficiently heated, because the warm airrushes from the furnace to the upper portions of buildings through long tubes with greater speed than to rooms that are nearer to the same level as the furnace.

My invention is made for the purpose Of giving greater extent of heatingsurface in a small compass, and at the same time allowing the air-space of the furnace to be divided into any number of sections as required for the airpipes that conduct the heated air to different portions of the building. By this construction I am enabled to apportion the heat as required for the different portions of the building.y Imake use of a series of air-tubes passing across over the fire, said tubes being introduced so as to allow for expansion a-nd contraction, and for removal when burnt out, and the air-box of the furnace is divided up so that any desired number of these air-tubes open into the compartments thereof, and from these compartments the separate tubes pass to the respective registers Where the hot air is delivered.

In the drawing, Figure l is a longitudinal section of the heating-furnace, and Fig. 2 is a cross-section through the air-box or chamber at the line w w,

The furnace is made of the side plates c and end plates b b', and c is the top sheet or crownplate, which may be corrugated if desired. These are of suitable size and shape 5 but I prefer the form shown 5 and the' entire furnace is inclosed in a brick casing, d; or a sheet-metal casingmight be substitutediu portable heaters. In either case there is an air-space, e, above the plate c, which should be at an upward inclination to facilitate the circulation of air, and the side air-spacesf opening into the air-box or chamber g. The plates b b are perforated and made with thimbles t' t', or short cylindrical projections, and into these thimbles the tubes lc are inserted and run across over the lire; hence are subjected to the direct and radiated heat from the fuel. The tubes are to slide freely through these thimbles z', so that the platesb b will not be displaced by expansion or contraction. The dust that will accumulate in these thiinbles or a lutin g of clay may serve to keep the parts gas-tight, so that the products of combustion will not escape. The air-box or chamber g is separated by plates linto compartments of the desired size, the required number of tubes k opening into each compartment, and the air-pipes m, leading one from each compartment, convey away the heated air to the various portions of the building to be heated. It is to be understood that the proper supply of fresh air is admitted to the pipes lc at the opposite end to the chamber g.

I claim as my invention 1. The ranges of air-pip es introduced through A the thimbles i in the plates b b of the furnace and above the re, with a hot-air chamber at one end, and the other end of such tubes Open foi` the admission of the air, as and for the purposes set forth.

2. The air-chamber divided by plates l and provided with the separate air-pipes on, in combination with the heating-furnace having' ranges of air-heating tubes Opening into the compartments of the air-chamber, as and for the purposes set forth.

3. The air-spaces ff at the sides of the furnace, and the air-space c above the crown-plate c, and at an inclina-tion upwardly and opening into the air-chamber g, substantially as set forth.

Signed by me this 25th November, A. D.

LORENZO B. TUPPER.

Guns. H. SMITH. (154) 

